docs: def unpack(destdir):
      """Unpack and Squash image to local filesystem"""
  
      if not nav:
          sys.exit(1)
  
      ecode = 0
      try:
          anchore_print("Unpacking images: " + ' '.join(nav.get_images()))
          result = nav.unpack(destdir=destdir)
          if not result:
              anchore_print_err("no images unpacked")
              ecode = 1
          else:
              for imageId in result:
                  anchore_print("Unpacked image: " + imageId)
                  anchore_print("Unpack directory: "+ result[imageId])
      except:
          anchore_print_err("operation failed")
          ecode = 1
  
      contexts['anchore_allimages'].clear()
      
      sys.exit(ecode)